RSA 231:191 Maximum Weight Limits.

I. The governing body of a municipality may establish maximum weight limits, seasonal or otherwise, which are more restrictive than limits set forth in RSA 266:17-26, for any class IV, V, or VI highway or portion of such highway, when the highway agent determines that such highway requires postings to prevent unreasonable damage or extraordinary municipal maintenance expense. Such posting shall be in accordance with currently acceptable practices and technology.
II. Maximum weight limits shall be posted, in the same manner as bridges are posted pursuant to RSA 234:39 and 266:18-c, at all entrances to the restricted highway or portion of such highway from other public highways. Such signage shall be legible, posted in a conspicuous location, and be of weather resistant material